Electric furnace steelmaking

4.11 - 1251 ratings - Source

Closing the secondary in delta, simply means connecting the plus end of one coil
to the minus end of a second coil, the plus end of the second coil to the minus ...
must be phased (faced) out properly); otherwise, symmetry about the centroid (
ground) is disturbed when they move forward or backward together. ... These
points are marked Xi , Xt , and X3 , respectively, in the nameplate wiring diagram.
... The coils in this case form a figure that looks like the letter aquot;Yaquot; or the radials of a
star.